I have a 1965 c10 stepside shortbox. installed rear gas tank kit from host and filler neck ends up right under rear bed brace and points to side, want tofill through stainless boat filler in rear bed, do I try using tubing bent at 90 attached to existing fill tube or is it possible to make new filler hole in top of tank by either rivets,solder, brazing or mig welding please give sugestions dont want to destroy new tank.